3 - you have lots to think about from the above posts. There is much in there that will be helpful to many of us.
Here is another example of how things may work out completely different from what you expect. Oops as my s would say I said a bad word. No expectations.
I am h's w#2. Possibly STB xw#2. Things were awkward at first with w1. Now (As mentioned above) she and I actually help each other out. She even occasionally babysit s for me. She and I spend more tune attending step kid stuff than h does. 2x a year we have a family dinner for the stepkids b days.
I was not an OW. I can't imagine being this evolved if H starts wanting me to be around OW. I guess my point is we don't know what the future holds so we just have to plan for today.
You have a lot of hard stuff to v think about. It will hurt. In some ways it is a good problem. Your kids have a dad that wants to spend time with them.
Me 44 H 42 M 10 T 12 (at time of BD) Ss 20 16 S11 (special needs)
BD 9/13 H "unhappy for years" moves to seperate bedroom 10/13 EA/PA confirmed but denied S and I move out 3/15